CN1511427A - Method and apparatus for link quality estimation in mobile communication network - Google Patents
Method and apparatus for link quality estimation in mobile communication network Download PDFInfo
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- CN1511427A CN1511427A CNA028103211A CN02810321A CN1511427A CN 1511427 A CN1511427 A CN 1511427A CN A028103211 A CNA028103211 A CN A028103211A CN 02810321 A CN02810321 A CN 02810321A CN 1511427 A CN1511427 A CN 1511427A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
- H04W36/20—Performing reselection for specific purposes for optimising the interference level
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/382—Monitoring; Testing of propagation channels for resource allocation, admission control or handover
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/20—Selecting an access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
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Abstract
A method and apparatus for link quality estimation of a potential TDMA-based wireless communication link between a mobile station (10) and a target base station (16a-c). The mobile station (10) receives a signal on a channel frequency of the target base station (16a-c) for measuring a link quality and identifying the target base station (16a-c) simultaneously based on the same received signal. The mobile station (10) qualifies the measurement if the target base station (16a-c) was identified properly. If not, the measurement is discarded. Measurements can then be tied to specific base stations more reliably, and are at the same time up to date when reported. This provides for secure connections and enables a tighter frequency reuse for enhancing the overall traffic capacity in the network.
Description
Technical field
The present invention relates generally to a kind of method for quality and equipment that is used to estimate the communication link between mobile radio station and base station, this can be used to select the base station that connects.Especially, the present invention utilizes mobile radio station that more reliable link quality measurements is provided.
Background technology
A mobile communications network typically comprises a plurality of base stations that are joined together by means of the switching node such as base station controller (BSC) and/or mobile switching centre (MSC).Each base station provides radio to cover being called as on the zone of sub-district, be used for carrying out radio communication with the mobile radio station that is positioned at wherein.Distribute a certain limited radio frequency spectrum to be used for emission for each mobile network, and make great efforts so that the volume of business of maximum possible is provided in the frequency spectrum that is distributed by network designer.In other words, the number that possible ongoing calling connects on radio channel is maximized.
In cellular network based on TDMA, typically give the radio-frequency channel of a plurality of appointments of each cell allocation, be used for calling out connecting and being used for broadcast message and give mobile radio station.Typically, hithermost neighbor cell can not use identical frequency to be used for connecting and broadcasting, and this is because this will cause unacceptable interference level between ongoing transmission.Therefore, at the sub-district channelized frequencies channel that is arranged on enough distances,, thereby in network, increase volume of business so that can not disturb each other too much.The sub-district designer is concerned about that dividing frequency is given the sub-district in the network that adopts multiplexer mode, and this is known usually in the art.
Carried out very big effort, so that can adopt aggressive reuse patterns as far as possible, that is, short multiplex distance, thus make the volume of business maximization.A key factor of considering is to select the alap transmitted power level of calling out and broadcasting of being used to, and disturbs to reduce, and has proposed to be used for ongoing calling is obtained the mechanism of accurate power controls.
Another field of being concerned about is the selection of the optimum base station (BS) that is used to connect.If the mobile radio station (MS) that is arranged in a sub-district and is connected to serving BS broadcasts leaves this BS and shifts to a neighbor bss, then signal strength signal intensity that old BS received or link-quality will reduce, and signal strength signal intensity or link-quality that new BS is received will increase, the connection preferably thereby new BS becomes requires littler transmitting power.There are the various known mechanism that are used for connection is switched to from old BS new BS, this is in the busy pattern (busymode) (promptly at mobile radio station, call out) time be commonly called " transfer (handover) " or " handover (handoff) ", and this is not commonly called " cell selecting " or " sub-district is reselected " when (that is, calling out but power supply is switched on) in being in idle pulley.For these two patterns, this is commonly called " BS selection " below.
It is the basic process that each MS is intended to be connected to a suitable BS that BS selects, and connects the link-quality maximization so that make, and makes transmitting power simultaneously and therefore to the minimum interference of other MS.In most of cellular networks now, MS is responsible for measuring from neighbor bss and from the signal of serving BS broadcasts, and the result is reported to serving BS broadcasts, so that compare.In order to achieve this end, each BS transmits at least one so-called broadcasting frequency continuously, and the MS on this broadcasting frequency in the network can carry out link quality measurements with respect to for example signal strength signal intensity and/or interference.Measure by certain BS being mated certain, the link-quality of each BS candidate is compared, and MS can attempt being connected to optimum BS subsequently during BS selects.Near MS, typically there is a lot of BS candidates, wherein can carry out BS and select these BS persons of waiting.In some system, before measuring, require MS to grant (qualify) and measure by recognition objective BS to the serving BS broadcasts report.
Obviously, must measure, so that an optimum BS candidate that is identified for connecting to all possible BS candidate.In order correctly certain measurement to be belonged to certain BS, each BS in this zone must discern itself uniquely by means of the signal that is broadcasted.When a MS was connected to a BS at first, this BS sent a measuring command, and this measuring command comprises the tabulation of the neighbor bss that will be measured by this MS.Such neighbor lists is predesignated for each sub-district, and comprises the sign (identity) and the broadcasting channel of each neighbor bss.In GSM, this BS sign is called as base station identity code (BSIC), and it comprises network colour code (NCC) and base station colour code (BCC).Depend on the cell configuration in the network, the number that is included in the BS in the neighbor lists is typically in the scope of 10-32.
Subsequently, not when utilizing serving BS broadcasts emission or receive its signal of connection, MS is according to the neighbor lists execution link quality measurements that receives at MS.In the time of in being in idle pulley, in order to save battery, the MS most of the time is in the sleep, and only is waken up occasionally, for example, according to a predetermined plan, listens to beep-page message or transmitting site and upgrades, and remaining a lot of times are used for measuring.In busy pattern, MS launches during the time slot of up link tdma frame usually, and receives during the time slot of down link tdma frame.Up link and descending chain circuit frame are offset mutually, so that typically exist one or more idle slot cycles to can be used for measuring between busy slot cycle.Measurement in the busy pattern is commonly called MAHO (MAHO) and measures.
Have some shortcoming in the method for measurement of using up to now or proposing, it will outline below.The present invention relates to reduce or eliminate these shortcomings.
In current method of measurement, when measuring specific target BS according to neighbor lists, MS be tuned to regulation channel frequency and measure its link-quality.This MS also attempts to decode or detect the signal that receives on that frequency, so that read this identification code that is used for target BS by during comprising the time slot of identification code, receiving at least one pulse train (burst), for example, BSIC.In GSM, BSIC is included in the pulse train of logical synchronization channel (SCH).But measurement and decoding separate at present in time, measure and decoding thereby carry out on different received pulse strings.Thereby, some problems may appear:
1) in when decoding, interference level may be too high, thereby though measure and may represent a strong BS candidate, MS fails the received signal of decoding.On a predetermined power level, launch at least one broadcast channel frequencies continuously by each BS.The mobile network typically is configured to: multiplexing broadcast frequency on nearest potential range, this typically causes interference problem in some zone.
2) if between decoding trial period owing to the signal propagation conditions make from the signal of wrong BS stronger by chance, the sign of another BS of the frequency that MS is can decoding multiplexing identical with target BS then.Therefore, this measurement may be attributed to wrong BS.In addition, if correct sign (for example, BSIC) by decoding early, then is discarded in all measurements of carrying out during current measuring period, even these measurements are effective measurements of a relevant important hand-off canaidates on this frequency.
3) the BS identification code may not be included in one or morely from the pulse train that target BS receives, and this is because broadcast channel comprises a plurality of according to a predetermined logic channel of planning to launch on the different time.These logic channels can comprise frequency correction channel (FCCH), synchronizing channel (SCH) and other public or special-purpose control channel and be used for the Traffic Channel that MS connects.The not every BS sign that all comprises of these logic channels.
In prior art solutions, the already mentioned in the above remedial measure for interference problem is to distribute unique broadcasting frequency to give each BS in big relatively zone, and this causes sparse channeling.But this number owing to available frequency is limited and quilt seldom is remaining is used for call business and causes other problem.Because the capacity of the Capacity Ratio broadcasting frequency of simple Traffic Channel frequency is much bigger, so the key constraints of the multiplexing formation entire system capacity of the sparse and poor efficiency of broadcasting frequency.
In EP 0886453A3, described and a kind ofly be used to discern neighbour BS to grant the method for the field strength measurement that is undertaken by MS.By using frame timing difference data or being used for the data of discontinuous transmission, make the detection of BSIC more reliable, wherein receive described data from serving BS broadcasts.These data are used to guarantee to detect BSIC from correct neighbor bss.But, do not have description to be used for the solution that quality of connection measures a special neighbourhood BS.
If MS does not successfully decode or detects the BS sign of expecting, this MS typically is configured to further discern trial, and this will spend some times.For example, in gsm system, MS is configured to carry out three additional identifications and attempts before abandoning a particular measurement.Even it is successful attempting for the first time, before the result is reported to serving BS broadcasts, after measuring, typically spend 5 seconds.Attempt for each additional identification, postponing increases by 2.4 seconds.In addition, the mean value of the measurement of the relevant typically a plurality of received pulse strings of the measurement of report.Therefore, when finally identifying the BS of expectation, MS successfully decodes and when sending measurement report to serving BS broadcasts, especially under the situation of fast moving MS, the measurement of carrying out in the past may be out-of-date in varying degrees.This may cause a kind of situation, that is, a good BS candidate is out in the cold.And the signal of measurement is the summation of all signals of launching from the information source of several multiplexing same frequencies, and therefore this total measure signal intensity and/or quality may further be misled (mislead).
Another problem is to have limited number of times between the desired measurement report.And, for example, in gsm system,, then require the every 480ms of MS (being sometimes referred to as average period) to send report for these six neighbor bss the strongest if the sign of six BS is successfully decoded.Owing to must measure one by one BS, therefore between the neighbor lists of long neighbor lists and weak point, have a compromise proposal.Long tabulation comprises that a lot of possible BS select candidate, and wherein each candidate can be measured simply.On the other hand, short tabulation may be lost some important candidate, and still included those can carry out the longer time (that is, more accurate) and measure.
In addition, because the neighbor bss measurement is normally used for calculating the cell relations that forms network planning basis, therefore the influence of inaccurate measurement report can expand to the accuracy that influences network configuration.
In a word, very importantly: the reliable neighbor bss measurement that obtains to have pinpoint accuracy; And will measure and corresponding report between time of delay reduce to minimum, to improve the BS option program and the network planning.Also wish to reduce interference effect, thereby allow more intensive channeling measuring.
Summary of the invention
The objective of the invention is to reduce or eliminate the problem that outlines above.This purpose and other purposes obtain by being provided for the method and apparatus that execution is estimated based on the link-quality of the wireless communication link of TDMA between mobile radio station and target BS.Mobile radio station is received signal on the channel frequency of target BS, and by the link-quality of moving station measuring received signal.Based on same received signal, recognition objective base station simultaneously, if the successful recognition objective of mobile radio station base station wherein, then this measurement is granted.Otherwise, if the not successful recognition objective of mobile radio station base station then abandons this measurement.
Therefore, based on same received signal, carry out simultaneously and measure and identification.Mobile radio station can maybe can be free of attachment to serving BS.If like this, the target BS of measurement is an adjacent base station, grant if wherein measure by the adjacent base station of the expectation that is correctly validated, then mobile radio station reports that after a while this measurement is to serving BS.Thereby link quality measurements can depend on (tie to) certain base station more reliably, and is up-to-date simultaneously when report.In addition, can in a measuring command, guide (direct) mobile radio station by serving BS, so that be chosen in the measurement and the identifying schemes of being programmed in advance in the mobile radio station.
The signal that is received is preferably measured one of at least at following: received signal intensity (RSS); Carrier-to-interference power ratio (C/I); Carrier power; And the error rate (BER).
According to a particular aspect of the invention, the signal that is received can comprise the sign of the base station of being detected by this mobile radio station.The signal that is received may further include the synchronizing channel pulse train that comprises this sign from the base station.
The signal that is received may further include the pulse train from the base station, and this pulse train comprises the training sequence by the mobile radio station estimation.Thereby the mode that this training sequence is known with mobile radio station is relevant with the sign of base station.Therefore, can from the training sequence of estimation, derive this sign based on the relation of knowing.The code of this training sequence further sign with target BS is identical.Pulse train from target BS can be void (dummy) pulse train that comprises the training sequence relevant with the sign of target BS.
The recognition objective base station can comprise that at least two kinds of different modulation formats of use attempt detecting received signal.Described received signal can comprise the ghost pulses string of the sign that comprises target BS.
Can implement the channel estimation to received signal at target BS, so that carry out at least one step among measurement and the identification step.If from received signal, derive one or more channel estimations, then can determine the channel estimation for one group of predetermined training sequence, can calculate and select to measure, and can select to produce the training sequence that MAXIMUM SELECTION is measured.
If target BS and mobile radio station are nonsynchronous, then the pulse train of synchronizing channel can be received by mobile radio station, to obtain timing information.Subsequently, based on the timing information that obtains, can the recognition objective base station.
The signal that is received preferably includes complete burst periods.
If the signal that is received comprises from the composition of a plurality of nonsynchronous target BS of launching on same frequency channels (contribution), then for the two objects base station can be sequentially once at a target BS execution measurement and identification at least.On the other hand, if the signal that receives comprises the composition from a plurality of synchronous target BS of launching on same frequency channels, then can in an operation, jointly carry out measurement and identification at these target BS at least two synchronous target BS.
The measurement of granting can be used for carrying out under free time or busy pattern base station selected, so that serve mobile radio station.The measurement of granting can also be used to estimate cell relations, so that carry out the network planning, or is used for determining the position of mobile radio station.
Processing procedure of the present invention can be implemented at the mobile radio station with the device that is used for carrying out this processing procedure.Processing procedure of the present invention can further be carried out by means of computer program, and this computer program comprises the software code of the method that is suitable for carrying out in mobile radio station.Computer program can directly be loaded in the built-in storage of computer of mobile radio station or be stored on the computer usable medium, comprises that the computer that is used for making mobile radio station carries out the readable program of this method.
Description of drawings
Referring now to the accompanying drawing of following the present invention is described in more detail, wherein:
Fig. 1 is the schematic diagram of a communication system, wherein carries out the radio link quality estimation according to the present invention.
Fig. 2 is the schematic diagram of an exemplary TDMA pulse train.
Fig. 3 is the flow chart of the step carried out in the processing procedure according to one aspect of the present invention of an explanation.
Fig. 4 is the flow chart of the step carried out in the processing procedure according to another aspect of the present invention of an explanation.
Fig. 5 is that an explanation is at the schematic diagram according to the workflow in the mobile radio station of one particular embodiment of the present invention.
Embodiment
Fig. 1 is a schematic diagram that comprises the cellular communications networks 12 of a plurality of BS.In this example, the MS 10 current serving BS broadcasts 14 that are connected to.As explaining that in the above MS 10 can be in idle pulley or be in the busy pattern.Originally, when MS 10 beginnings were connected with serving BS broadcasts 14, MS 10 received a measuring command that has neighbor lists from BS 14, this neighbor lists comprises the broadcasting frequency and the sign of a plurality of predetermined neighbor bss, wherein show three BS, that is, and 16a-16c.If MS 10 is in the idle pulley, receive this neighbor lists through a control channel comprising on the broadcast frequency channel of various cell informations.If MS 10 is in the busy pattern, that is, be switched to new serving BS broadcasts 14 from the BS (not shown) in a Geju City, the logical control channel in then can the Traffic Channel through being embedded in use receives this neighbor lists.
In both cases, during idling cycle, order MS 10 on the broadcasting frequency of appointment, to carry out link quality measurements thus, and transmission report to serving BS broadcasts 14 according to predetermined a plan.This plan can be prescribed in measuring command, perhaps can be programmed in advance in MS 10.Alternatively, for example, similar when MS 10 just has been switched on power supply, MS 10 also is not connected to any serving BS broadcasts.MS is scans for broadcast frequencies and the strongest frequency of measurement then, so that to a serving BS broadcasts registration.
One of below link-quality can be measured as at least: received signal intensity (RSS); Carrier-to-interference power ratio (C/I); Carrier power; The error rate (BER); Or any other link quality parameter.Yet the present invention is not limited to any specific method of measurement or plan.
According to one aspect of the present invention,, side by side carry out and measure and identification activity for each target BS based on same received signal.In this context, " simultaneously " expression: though not necessarily accurately simultaneously, be close to execution concurrently by the different function units among the MS and measure and identification.If MS 10 is the BS of successfully correct identification expectation thus, then this measurement is left in the basket and disregards, and carries out a new identification and attempt, and it comprises that also one is measured new the time.In this way, guarantee to measure for the BS that is discerned veritably, and this measurement is up-to-date.
In GSM, BS sign BSIC comprises in the pulse train on synchronous channel SCH.In this case, can carry out BS identification by reading just measured SCH pulse train.
In existing system, depend on the agreement of this system's regulation, BS is identified in certain logic channel pulse train and is sent out.As above described for GSM, base station identity code BSIC comprises network colour code NCC and base station colour code BCC.In addition, broadcast frequency channel generally includes a plurality of multiplexed logic channels, this multiplexed logic channel comprise paging channel PCH and the common point mentioned in the past to multidrop channel BCCH, FCCH and SCH, and special-purpose point-to-point Traffic Channel TCH.In gsm system, BSIC only is included among the SCH usually, and is not included in other the logic channel.If MS is among the busy pattern, therefore, before its of reception is used to read the SCH pulse train of BSIC, will spend some times.
In addition, all normal burst typically comprise a training bit sequence, its under the situation of GSM be 26 long.In addition, " normally " pulse train can be only to comprise the FCCH pulse train of the sine wave that is used for frequency-synchronized and comprise the longer SCH pulse train that is used for the synchronized specific training sequence of initial TDMA pulse train.
From the training sequence in the normal burst of serving BS broadcasts is that MS knows, and helps the decoding or the detection of synchronization and pulse train.Typically, have one group of known training sequence, comprise for example eight different sequences, and the sequence of using in a specific pulse train is to discern by for example 3 midamble code TSC.For the common signal channel in GSM, TSC is identical with BCC, and for one other channel, transmits TSC in channel assignment message.
According to another aspect of the present invention, the mode that the BS sign is known with mobile radio station is relevant with midamble code.Do not consider which logic channel the pulse train that receives belongs to, by the estimation training sequence with from wherein deriving midamble code, the MS that receives normal burst can determine this BS sign then.Under the simplest situation, it is identical that the BS sign is set to midamble code.But other correlation also is possible.
Fig. 2 illustrates an exemplary normal burst 20 with schematic diagram, and this normal burst 20 sends in the target BS from be included in the neighbor lists that is received by MS in the time slot of a broadcast frequency channel.Normal burst 20 can belong to any logic channel, and comprises a bit field 22 that has training sequence, and this bit field 22 approximately is arranged on the centre of pulse train in this case.Pulse train 20 may further include different field 24,26, such as data bit field, tail bit field or the like.
According to one embodiment of the present of invention and with reference to this flow chart in Fig. 3, in first step 300, MS receives a radio signal that comprises pulse train or its at least a portion from target BS.In step 302, MS measures the link-quality of pulse train 20, and in step 304, based on identical received pulse string, attempts the training bit sequence of estimation in bit field 22 simultaneously.If determine that in step 306 it is successful that this estimation is attempted, then in step 308, MS can be by determining the BS sign from wherein deriving midamble code, as explaining in the above.The measurement of carrying out in step 302 is effectively and can be used.But if this estimation trial is unsuccessful, then in step 310, this measurement is dropped.
In this way, have an opportunity from all normal burst, to determine the BS sign for MS.What here should replenish is that the signal that possible need a unnecessary measurement is to obtain average value measured.In addition, the training sequence estimation can comprise the known method of the signal that is used for detecting noise and disturbs, such as Maximum Likelihood Detection algorithm or least mean-square error method.
Alternatively, training sequence can estimate that according to the channel of one aspect of the present invention it will be described below by using.Subsequently, implement the channel estimation for some candidates' training sequence, it is selected wherein to maximize the training sequence that certain selection measures.It is this signal power estimation that an exemplary selection is measured.
In some system, for example, use EDGE (for the enhancing data rate of GSM/TDMA136 evolution) technology, surpass a kind of modulation format and can be used for the BS emission, and therefore be further used for training sequence group.For example in EDGE, can use 8PSK modulation and GMSK to modulate both.In this case, between the BS recognition phase, also need to consider the training sequence that adds.For the blind Detecting of modulation, need an estimation to attempt for each possible modulation format.
The processing procedure for the link-quality of the target BS that is included in neighbor lists is determined in for example clear exemplary being used for according to another aspect of the present invention of flow chart in Fig. 4.In this example, two kinds of different modulation formats 1 and 2 can be used by target BS.In first step 400, by a MS received signal or pulse train on the channel frequency that will measure according to tabulation.In step 402, the link-quality of received signal is measured such as RSS at a predetermined parameter.
Parallel with measuring process 402, use modulation 1 and use modulation 2 to attempt estimation training sequence (TS) in step 404 in step 406.In step 408, depend on this result, come automodulation 1 or 2 most probable estimations selected.In step 410, determine whether selected estimation is attempted is successful, and, can determine the BS sign in step 412 if like this, therefore grant measurement from step 402.On the other hand, if selected estimation trial is unsuccessful, then this measurement of carrying out in step 402 is dropped in step 416.
In cellular network, in the reality usually can't help on broadcast frequency channel, to send the ghost pulses string in the time slot that any logic channel occupies, so that keep continuous transmission.The ghost pulses string does not carry any intelligible information, and typically, sends a predetermined bit pattern.Therefore, determine that from above-mentioned ghost pulses string any BS sign is impossible, this may occur quite continually.According to another aspect of the present invention, the ghost pulses string that sends on broadcast frequency channel comprises the BS sign or identifies relevant training sequence with this BS.This will further improve the possibility that mobile radio station is determined the BS sign.
According to another aspect of the present invention,, use channel estimation process to be used for determining the BS sign from received signal as explaining below.
Channel estimation be a kind of be used for from the known method of the radio signal estimation physical channel that receives during serving BS broadcasts is connected.Based on corresponding training sequence, implement the channel estimation for given TSC on the receiver in MS.Typically, the purpose of channel estimation is to determine channel impulse response, is used for helping being included in the decoding of the control data and the user data of signal.According to the present invention, the purpose of other of use channel estimation can strengthen link quality measurements and training sequence estimation, and therefore it can be used for BS identification.
The total signal that is received is the summation from the composition of the BS of a plurality of multiplexing same frequencies.Can arrive at the stack of different propagation reflections ripples of the signal of MS by the BS emission, with different delays from the signal component of each BS.Receiver experiences the signal that sends with different channel tap (tap) effectively on physical channel.Therefore this channel and its tap can be estimated by means of the channel estimation in receiver.As mentioned above, this can be used to estimate training sequence.When definite which training sequence most possibly had been inserted in the signal that is sent, the TSC of training sequence or equivalence can be mapped to the BS sign, was used for determining according to BS sign of the present invention.
In addition, the estimation of received signal power can be calculated as channel tap squared absolute value and.Disturb and/or noise power also can be by from wherein estimation, and carrier-to-interference power ratio C/I can estimate from signal power and interference and/or noise power.Exist and many estimate available known technology for channel, for example, so-called least square estimation because the present invention does not relate to any specific channel estimation or equipment, thereby will not be further described it.
In existing known mobile system, the channel estimation only is to be implemented for the signal that is connected with serving BS broadcasts by MS.According to one embodiment of the present of invention, the channel estimation is to carry out for the received signal of frequency channels, is used for for example discerning one or more BS according to neighbor lists.The channel estimation further can be used for the measure link quality with the training sequence estimation or with an independent calculation procedure.
The exemplary embodiment of a training sequence estimation comprises: determine the channel estimation for one group of predetermined training sequence; Calculate and select to measure; The training sequence that maximum selection is measured with selecting generation.Maximum selected amount kilsyth basalt shows that corresponding training sequence is that most probable is launched.Predetermined training sequence group can be selected according to the corresponding TSC that is mapped to the BS sign in neighbor lists.It is the signal power of explaining as in the above that an exemplary selection is measured, perhaps the C/I estimation of deriving from the channel estimation that obtains.For example, can select to cause the training sequence of maximum signal power or maximum C/I estimation.By selected training sequence being mapped to a BS in the neighbor lists, therefore, for what comprised in the measurement report, the measurement of carrying out is owing to this BS simultaneously.
Link quality measurements can also obtain by implement the channel estimation for the signal that comes the BS in the comfortable neighbor lists.Above-mentioned measurement can be signal power and C/I estimation, and it can also be used as selects to measure.To be the channel estimation signal that target BS is required separate from the unwanted signal of other BS and noise the benefit of above-mentioned measurement inherently.Therefore, and before compare based on the method for RSS, the accuracy of this measurement is enhanced.
According to one aspect of the present invention, the signal that is received comprises complete burst periods, therefore allows MS to read in any information that wherein embeds.
The mobile network can comprise with respect to down link TDMA pulse train transmission phase mutually synchronization or nonsynchronous BS.Under the situation of the mobile network with asynchronous BS, MS need scan complete burst periods so that suitably detect training sequence, this be because from pulse train start and end time separately of neighbor bss be that MS institute is ignorant.But when MS was in busy pattern, supposing had available finite time to be used to receive other signals except the signal of serving BS broadcasts, and this may be unsuccessful sometimes.Therefore, depend on the estimation window size, MS can receive only the part of pulse train from this neighbor bss, and it may not comprise this whole training sequence.In addition, the performance of training sequence estimation increases and reduces along with estimation window.
According to another aspect of the present invention, MS can pass through at first pulse train synchronizing channel of search on broadcasting frequency, is SCH in the GSM example, determines the time of burst periods from target BS.Because the pulse train synchronizing channel typically comprises the training sequence longer than normal burst, so the pulse train synchronizing channel can be detected and decode reliably.From this logic channel, MS can obtain the timing information of burst periods from this specific BS.This timing information for example, with a form with respect to the time offset of this serving BS broadcasts estimation, can be used to the measurement and the decoding of normal burst then, and can be stored among the MS, is used for the measurement on this frequency channels after a while.
Under the pulse train from nonsynchronous BS of a plurality of multiplexing identical frequency channels is included in situation in the signal of reception, simultaneous measurement and BS identification can be carried out from the different received signal part from target BS by MS, and these different received signals partly are formed on the identical frequency simultaneously the summation of the signal that receives from those target BS.Thereby, the total signal that is received can by detect corresponding training sequence, preferably use channel estimation, sequentially estimate with respect to each target BS one at a time.
On the other hand, if target BS and serving BS broadcasts and MS pulse train are synchronous, since MS will with respect to its own and this serving BS broadcasts synchronously, know automatically where it appears in the pulse train, therefore for MS from wherein reading a normal burst and estimating that suitably training sequence will be more easy.In a network that has a synchronous BS, therein pulse train and training sequence will be therefore at least in relative little distance, the BS around a plurality of arrive at this MS approximately simultaneously.
Under the pulse train from the synchronous BS of a plurality of multiplexing same frequency channels is included in situation in the signal of reception, simultaneous measurement and BS identification can be by the part of this MS from received signal, that is the summation of the signal that on same frequency, receives from those target BS simultaneously and carrying out.Thereby, the total signal that is received can by detect corresponding training sequence, preferably use channel estimation, sequentially estimate with respect to each target BS one at a time.
Alternatively, for each BS among a plurality of BS of multiplexing same frequency, it also is possible carrying out estimation on the resultant signal of the same reception of using the channel estimation with respect to jointly.In this case, in the training sequence estimation process of an associating, utilize the existence of synchronous training sequence of the covering of BS, the training sequence estimation process of this associating is estimated the training sequence of one group of emission, for example, according to maximum likelihood or least mean-square error principle.Therefore channel estimation with respect to the associating of evaluating wireless radio channel simultaneously of all target BS signals can be used for this purpose.This obviously relates to the complexity of increase, but because a plurality of BS are side by side measured and discern, therefore can increase processing speed, and certainty of measurement can be improved considerably.
This illustrates as the schematic workflow that receives total signal 502 in MS 500 in Fig. 5.Signal 502 comes the summation of the synchronization burst a-c of three BS launching on the comfortable identical frequency.In the example of this simplification, do not consider other signal component from other BS.Resultant signal 502 enters a channel estimation unit by module 504 expressions.This channel estimation is passed through sequentially or this channel of joint estimate, produces three channels estimations 506 corresponding to three signal components from pulse train a-c respectively.Estimate this three channel estimations 506 then, that is, and by the parallel measurement and the identification of module 508 expressions.Should be appreciated that this measurement and identification processing procedure can also comprise the total signal 502 that is received and further calculate in channel estimation unit 504.If corresponding BS identification is successful, then this corresponding results is transfused to into measurement report 510, and this measurement report finally is sent to serving BS broadcasts 512.Alternatively, do not have at MS under the situation of serving BS broadcasts, this result can be used to select a suitable BS to register by MS.
Aforesaid different embodiment has the accuracy of raising MS measurement on target BS and the purpose of relevance.This measurement can rely on specific BS more reliably, and in the time of report and/or estimation, compares with existing solution, is up-to-date more simultaneously.In addition, link-quality estimation of the present invention is more insensitive to disturbing, and it considers more intensive channeling, especially broadcasting frequency in mobile network's different sub-district.Therefore channeling more intensive in network has improved whole message capacity.
In measuring command, can guide MS to select any one scheme among aforesaid various measurement and the identifying schemes by serving BS broadcasts, its all or some of them can in MS, programme in advance.
Suppose in the superincumbent description, perhaps rigidly connect energize, perhaps under busy or idle pulley, the measurement result of report is mainly used in the BS that selects optimal confession to be connected with MS.But this measurement result can also be used for the estimation of cell relations, so that network enabled planning.For example, cell relations comprises: be assigned with the interference level of estimating when identical or adjacent frequency channels is used to transmit in the sub-district.Based on the cell relations of estimation, the typical network planning task that can carry out comprises: cell pattern and transmitted power level are set; Carry out the antenna adjustment; With frequency allocation parameters and handoff threshold are set.
The present invention can realize with the computer program in the built-in storage of the computer that can be loaded in mobile radio station (10) or to be stored in the computer program that being used on the computer usable medium control mobile radio station (10).
Though described the present invention with reference to specific exemplary embodiment, this description only is intended to illustrate inventive concept of the present invention, and should not be considered to limit the scope of the invention.Can use various alternatives, modification and equivalence, and not break away from spirit of the present invention defined by the appended claims.
Claims
(according to the modification of the 19th of treaty)
1. method of between mobile radio station (10) and target BS (16a-c), carrying out based on the link-quality estimation of the wireless communication link of TDMA, wherein said mobile radio station (10) received signal on the channel frequency of described target BS (16a-c), it is characterized in that the following step of in described mobile radio station, carrying out:
-measure the link-quality of described received signal, and discern described target BS (16a-c) concurrently simultaneously based on same received signal and described measurement; With
If-described mobile radio station (10) is successfully discerned described target BS (16a-c) based on the signal of described reception and measurement, then grant described being measured as effectively; Perhaps
If-described mobile radio station (10) is not successfully discerned described target BS (16a-c) based on the signal of described reception and measurement, then abandon described measurement.
2. according to the method for claim 1, wherein said mobile radio station (10) is connected to serving BS (14), and described target BS (16a-c) is an adjacent base station, it is characterized in that, reports the further step that described serving BS (14) is given in the measurement of described permission by described mobile radio station (10).
3. according to the method for claim 2, it is characterized in that: in measuring command, guide described mobile radio station (10) by described serving BS (14), to select to be used to carry out the measurement and the identifying schemes of measurement and identification step, the described scheme of wherein in described mobile radio station (10), programming in advance.
4. according to the method for any one claim among the claim 1-3, it is characterized in that: measure described received signal at one of following at least: received signal intensity (RSS); Carrier-to-interference power ratio (C/I); Carrier power; And the error rate (BER).
5. according to the method for any one claim among the claim 1-4, it is characterized in that: described received signal comprises the sign of the described target BS (16a-c) that is detected by described mobile radio station (10).
6. according to the method for claim 5, it is characterized in that: described received signal comprises the synchronizing channel pulse train that comprises described sign from described target BS (16a-c).
7. according to the method for any one claim among the claim 1-4, wherein said received signal comprises from the pulse train that comprises training sequence of described target BS (16a-c), it is characterized in that: described identification step comprises following substep:
-estimate described training sequence by described mobile radio station (10), the mode that wherein said training sequence is known with described mobile radio station (10) is relevant with the sign of described target BS (16a-c); With
-from the training sequence of estimation, derive described target BS sign based on the relation of knowing.
8. according to the method for claim 7, it is characterized in that: the code of described training sequence and described target
A 19. mobile radio station (10), comprise the device that is used for received signal on the channel frequency of target BS (16a-c), so that utilize the link-quality estimation of described target BS (16a-c) execution based on the wireless communication link of TDMA, it is characterized in that: described mobile radio station (10) further comprises:
-be used to measure the link-quality of described received signal and be used for discerning simultaneously concurrently the device of described target BS (16a-c) based on same received signal and described measurement;
-be used for when described mobile radio station (10) is successfully discerned described target BS (16a-c) based on the signal of described reception and measurement granting the described effective device that is measured as; With
-be used for when described mobile radio station (10) is not successfully discerned described target BS (16a-c) based on the signal of described reception and measurement, abandoning the device of described measurement.
20. mobile radio station (10) according to claim 19, wherein said mobile radio station (10) is connected to serving BS (14), and described target BS (16a-c) is an adjacent base station, it is characterized in that described mobile radio station (10) further comprises the device that is used for by described mobile radio station (10) measurement report of granting being given described serving BS (14).
21. mobile radio station (10) according to claim 20, it is characterized in that: described mobile radio station (10) further comprises measurement and the identifying schemes that at least one is programmed in advance, wherein guides described mobile radio station (10) to select to measure and identifying schemes in measuring command by described serving BS (14).
22. the mobile radio station (10) according to any one claim among the claim 19-21 is characterized in that: described measurement mechanism is measured described received signal at one of following at least: received signal intensity (RSS); Carrier-to-interference power ratio (C/I); Carrier power; And the error rate (BER).
23. the mobile radio station (10) according to any one claim among the claim 19-22 is characterized in that: described recognition device detects the sign that is included in the described target BS (16a-c) in the described received signal.
24. mobile radio station (10) according to any one claim among the claim 19-22, it is characterized in that: described recognition device estimation is included in the training sequence in the described received signal, the mode that wherein said training sequence is known with described mobile radio station (10) is relevant with the sign of described target BS (16a-c), and described recognition device is further derived described sign based on the relation of knowing from the training sequence of estimation.
25. the mobile radio station (10) according to any one claim among the claim 19-24 is characterized in that: described recognition device uses at least two kinds of different modulation formats to attempt detecting described received signal.
26. mobile radio station (10) according to any one claim among the claim 19-22,24 and 25, it is characterized in that: described mobile radio station (10) comprises further and is used at described target BS (16a-c) described received signal being implemented the device that channel is estimated that wherein said channel estimation is used for measuring and identification.
27. according to the mobile radio station (10) of claim 26, wherein derive one or more channel estimations from described received signal, it is characterized in that: described mobile radio station (10) further comprises:
-be used for determining device for the channel estimation of one group of predetermined training sequence;
Claims (33)
1. method of between mobile radio station (10) and target BS (16a-c), carrying out based on the link-quality estimation of the wireless communication link of TDMA, wherein said mobile radio station (10) received signal on the channel frequency of described target BS (16a-c) is characterized in that the following step:
-measure the link-quality of described received signal by described mobile radio station (10);
-discern described target BS (16a-c) simultaneously based on same received signal; With
If-described mobile radio station (10) is successfully discerned described target BS (16a-c), then grant described measurement; Perhaps
If-described mobile radio station (10) is not successfully discerned described target BS (16a-c), then abandon described measurement.
2. according to the method for claim 1, wherein said mobile radio station (10) is connected to serving BS (14), and described target BS (16a-c) is an adjacent base station, it is characterized in that, reports the further step that described serving BS (14) is given in the measurement of permission by described mobile radio station (10).
3. according to the method for claim 2, it is characterized in that: guide described mobile radio station (10) with measuring command by serving BS (14), to select to be used to carry out the measurement and the identifying schemes of measurement and identification step, the described scheme of wherein in mobile radio station (10), programming in advance.
4. according to the method for any one claim among the claim 1-3, it is characterized in that, measure one of at least described received signal at following: received signal intensity (RSS); Carrier-to-interference power ratio (C/I); Carrier power; And the error rate (RER).
5. according to the method for any one claim among the claim 1-4, it is characterized in that described received signal comprises the described target BS (sign of 16a-c that is detected by described mobile radio station (10).
6. according to the method for claim 5, it is characterized in that described received signal comprises the synchronizing channel pulse train that comprises described sign from described target BS (16a-c).
7. according to the method for any one claim among the claim 1-4, wherein said received signal comprises that from the pulse train that comprises training sequence of described target BS (16a-c) it is characterized in that, described identification step comprises following substep:
-estimate described training sequence by described mobile radio station (10), the mode that wherein said training sequence is known with described mobile radio station (10) is relevant with the sign of target BS (16a-c); With
-from the training sequence of described estimation, derive described target BS sign based on the relation of knowing.
8. according to the method for claim 7, it is characterized in that: the code of described training sequence is identical with the sign of described target BS (16a-c).
9. according to the method for any one claim among the claim 1-8, it is characterized in that: described identification step comprises that at least two kinds of different modulation formats of use attempt detecting described received signal.
10. according to the method for any one claim among the claim 1-9, it is characterized in that: described received signal comprises the ghost pulses string of the sign that comprises described target BS (16a-c).
11. the method according to claim 7 or 8 is characterized in that: the pulse train from target BS (16a-c) is the ghost pulses string, and described ghost pulses string comprises the relevant training sequence of sign with described target BS (16a-c).
12. the method according to any one claim among claim 14 and the 7-11 is characterized in that: implement the channel estimation to received signal at described target BS (16a-c), so that carry out at least one step among measurement and the identification step.
13. according to the method for claim 12, wherein derive one or more channel estimations from described received signal, it is characterized in that: described identification step comprises following substep:
-determine to estimate for the channel of one group of predetermined training sequence;
-calculate and select to measure; With
-select those to produce the training sequence that maximum selection is measured.
14. method according to any one claim among the claim 1-13, wherein said target BS (16a-c) is nonsynchronous with described mobile radio station (10), it is characterized in that: described mobile radio station (10) receives the synchronizing channel pulse train so that obtain timing information, and wherein said identification step is based on the timing information that obtains.
15. the method according to any one claim among the claim 1-14 is characterized in that: described received signal comprises complete burst periods.
16. method according to claim 12, wherein said received signal comprises coming the composition of a plurality of nonsynchronous target BS of launching on the comfortable same frequency channels, it is characterized in that: the step of at every turn carrying out described measurement and identification at least two target BS at a target BS in proper order.
17. method according to claim 12, wherein said received signal comprises coming the composition of a plurality of synchronous target BS of launching on the comfortable same frequency channels, it is characterized in that: the step of jointly carrying out described measurement and identification at least two synchronous target BS in an operation at described target BS.
18. the method according to any one claim among the claim 1-17 is characterized in that: the measurement of described permission is used to one of at least following: in free time or busy pattern, carry out base station selected so that serve described mobile radio station (10); The estimation cell relations; With the position of determining described mobile radio station (10).
A 19. mobile radio station (10), comprise the device that is used for received signal on the channel frequency of target BS (16a-c), so that utilize the link-quality estimation of described target BS (16a-c) execution, it is characterized in that described mobile radio station (10) further comprises based on the wireless communication link of TDMA:
-be used to measure the device of the link-quality of described received signal;
-be used for discerning simultaneously the device of described target BS (16a-c) based on described same received signal; With
-the device that is used for when described mobile radio station (10) is successfully discerned described target BS (16a-c), granting described measurement or when described mobile radio station (10) is not successfully discerned described target BS (16a-c), abandons described measurement.
20. mobile radio station (10) according to claim 19, wherein said mobile radio station (10) is connected to serving BS (14), and described target BS (16a-c) is an adjacent base station, it is characterized in that: described mobile radio station (10) further comprises the device that is used for by mobile radio station (10) measurement report of granting being given described serving BS (14).
21. mobile radio station (10) according to claim 20, it is characterized in that: described mobile radio station (10) further comprises measurement and the identifying schemes that at least one is programmed in advance, wherein guide described mobile radio station (10) according to measuring command, to select measurement and identifying schemes by described serving BS (14).
22. the mobile radio station (10) according to any one claim among the claim 19-21 is characterized in that: described measurement mechanism is measured described received signal at one of following at least: received signal intensity (RSS); Carrier-to-interference power ratio (C/I); Carrier power; And the error rate (BER).
23. the mobile radio station (10) according to any one claim among the claim 19-22 is characterized in that: described recognition device detects the sign that is included in the described target BS (16a-c) in the described received signal.
24. mobile radio station (10) according to any one claim among the claim 19-22, it is characterized in that: described recognition device estimation is included in the training sequence in the described received signal, the mode that wherein said training sequence is known with described mobile radio station (10) is relevant with the sign of described target BS (16a-c), and described recognition device is further derived described sign based on the relation of knowing from the training sequence of described estimation.
25. the mobile radio station (10) according to any one claim among the claim 19-24 is characterized in that: described recognition device uses at least two different modulation formats to attempt detecting described received signal.
26. mobile radio station (10) according to any one claim among the claim 19-22,24 and 25, it is characterized in that: described mobile radio station (10) further comprises the device that is used for implementing to received signal at described target BS (16a-c) the channel estimation, and described channel estimation is used for measuring and identification.
27. according to the mobile radio station (10) of claim 26, wherein derive one or more channel estimations from described received signal, it is characterized in that: described mobile radio station (10) further comprises:
-be used for determining device for the channel estimation of one group of predetermined training sequence;
-be used to calculate and select the device measured; With
-be used to select those to produce the device of the training sequence that maximum selections measure.
28. mobile radio station (10) according to any one claim among the claim 19-27, wherein said target BS (16a-c) is nonsynchronous with described mobile radio station (10), it is characterized in that: described mobile radio station (10) comprises further and is used to receive the synchronizing channel pulse train to obtain the device of timing information that wherein said recognition device uses the timing information that obtains.
29. mobile radio station (10) according to claim 26, wherein said received signal comprises coming the composition of a plurality of nonsynchronous target BS of launching on the comfortable same frequency channels, and it is characterized in that: described measurement and recognition device are sequentially measured and discerned at a target BS at every turn at least two target BS.
30. mobile radio station (10) according to claim 26, wherein said received signal comprises coming the composition of a plurality of synchronous target BS of launching on the comfortable same frequency channels, and it is characterized in that: described measurement and recognition device are jointly measured and discerned at described target BS in an operation at least two synchronous target BS.
31. the mobile radio station (10) according to any one claim among the claim 19-30 is characterized in that: described mobile radio station (10) further comprises and is used for carrying out base station selected device based on measurement result.
32. a computer program can directly be loaded in the built-in storage of the computer in the mobile radio station (10), comprises the software code devices that is used to carry out according to the method for any one claim among the claim 1-18.
33. a computer program that is stored on the computer usable medium comprises being used for making the readable program of the computer execution of mobile radio station (10) according to the method for any one claim among the claim 1-18.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100373975C (en) * | 2005-08-22 | 2008-03-05 | 中兴通讯股份有限公司 | Channel measuring quantity reporting method in CDMA system |
| CN110072252A (en) * | 2014-06-27 | 2019-07-30 | Lg电子株式会社 | The method and apparatus that device terminal is measured by device in wireless communication system |
Families Citing this family (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6973314B2 (en) * | 2001-09-28 | 2005-12-06 | Arraycomm Llc. | System and related methods for clustering multi-point communication targets |
| EP1695583B1 (en) | 2003-12-18 | 2014-08-13 | TELEFONAKTIEBOLAGET LM ERICSSON (publ) | A method and apparatus for determining the content of bursts to be transmitted from a base station |
| JP4468385B2 (en) * | 2004-03-04 | 2010-05-26 | サムスン エレクトロニクス カンパニー リミテッド | System and method for controlling operation mode of medium connection control layer in broadband wireless access communication system |
| WO2006020636A2 (en) * | 2004-08-10 | 2006-02-23 | Nextel Communications, Inc. | System and method for handoff between base stations |
| FI20045318A0 (en) * | 2004-09-01 | 2004-09-01 | Nokia Corp | A communication system, a receiver, and a method for evaluating the quality of the received signal |
| AU2005301432B2 (en) * | 2004-11-04 | 2008-10-23 | Nokia Technologies Oy | Apparatus and method for signal transmission and reception using downlink channel information in a sleep mode in a BWA communication system |
| GB2421148B (en) * | 2004-12-08 | 2007-04-11 | Motorola Inc | Mobile station,system and method for use in cellular communications |
| JP5049463B2 (en) * | 2004-12-14 | 2012-10-17 | 富士通株式会社 | Wireless communication system, base station, mobile station, and wireless communication method |
| CN101385372A (en) * | 2006-02-21 | 2009-03-11 | 艾利森电话股份有限公司 | Handover in a wireless network back to a restricted local access point from an unrestricted global access point |
| KR101325923B1 (en) * | 2006-11-06 | 2013-11-07 | 삼성전자주식회사 | Enhanced data transport system for mobile phone and method using the same |
| JP5451775B2 (en) * | 2008-12-19 | 2014-03-26 | エヌイーシー ヨーロッパ リミテッド | Link quality estimation method in wireless network |
| WO2010099049A2 (en) | 2009-02-24 | 2010-09-02 | Eamonn Gormley | Base station reference frequency and timing correction |
| WO2010098971A2 (en) * | 2009-02-24 | 2010-09-02 | Eamonn Gormley | Base station reference frequency correction and timing correction using transceiver feedback |
| GB2469027A (en) * | 2009-03-30 | 2010-10-06 | Nec Corp | Enabling a mobile to make inter-RAT measurements |
| US20110075630A1 (en) * | 2009-09-25 | 2011-03-31 | Eilon Riess | Enabling inter frequency assignment scanning while remaining at one frequency |
| EP2309657A1 (en) | 2009-10-08 | 2011-04-13 | Thomson Licensing | Method for topology control using sectorized antennas in wireless networks |
| US8259652B2 (en) * | 2009-11-17 | 2012-09-04 | Apple Inc. | Location-based network detection |
| US9439103B2 (en) * | 2010-01-14 | 2016-09-06 | Nokia Technologies Oy | Systems, methods, and apparatuses for modem coordination |
| US10448355B2 (en) * | 2018-03-06 | 2019-10-15 | Telefonaktiebolaget Lm Ericsson (Publ) | Radio location technique |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5214687A (en) * | 1991-06-05 | 1993-05-25 | Nokia Mobile Phones Ltd. | Method to determine transmission quality |
| FR2710805B1 (en) * | 1993-09-29 | 1995-11-10 | Alcatel Mobile Comm France | Filling burst structure in a digital cellular radio system using the principle of TDMA, and base station for the development of such a structure. |
| US6125125A (en) * | 1996-10-18 | 2000-09-26 | Symmetricom, Inc. | Synchronization of TDMA cell sites |
| US6594250B1 (en) * | 1996-11-14 | 2003-07-15 | Nokia Telecommunications Oy | Method of monitoring base stations with discontinuous control channel transmissions |
| FI105251B (en) * | 1997-06-18 | 2000-06-30 | Nokia Mobile Phones Ltd | A method for identifying base stations in a time division cellular network in a mobile station and a mobile station |
| US5966657A (en) * | 1997-07-24 | 1999-10-12 | Telefonaktiebolaget L M Ericsson (Publ) | Method and system for radio frequency measurement and automatic frequency planning in a cellular radio system |
| FI112892B (en) * | 1999-04-14 | 2004-01-30 | Nokia Corp | A method and receiver for receiving and decoding signals modulated by various modulation methods |
| GB2350018B (en) * | 1999-05-08 | 2003-07-30 | Motorola Ltd | A method of and apparatus for estimating a characteristic of a signal |
| US6728228B1 (en) * | 1999-09-20 | 2004-04-27 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and system for measuring and reporting received signal strength |
| US6754509B1 (en) * | 1999-12-30 | 2004-06-22 | Qualcomm, Incorporated | Mobile communication device having dual micro processor architecture with shared digital signal processor and shared memory |
-
2001
- 2001-05-21 SE SE0101793A patent/SE523070C2/en not_active IP Right Cessation
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2002
- 2002-05-17 AT AT02733716T patent/ATE374510T1/en not_active IP Right Cessation
- 2002-05-17 CN CNB028103211A patent/CN1235440C/en not_active Expired - Fee Related
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- 2002-05-17 WO PCT/SE2002/000960 patent/WO2002096149A1/en active IP Right Grant
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100373975C (en) * | 2005-08-22 | 2008-03-05 | 中兴通讯股份有限公司 | Channel measuring quantity reporting method in CDMA system |
| CN110072252A (en) * | 2014-06-27 | 2019-07-30 | Lg电子株式会社 | The method and apparatus that device terminal is measured by device in wireless communication system |
Also Published As
| Publication number | Publication date |
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| SE523070C2 (en) | 2004-03-23 |
| SE0101793L (en) | 2002-11-22 |
| CN1235440C (en) | 2006-01-04 |
| ATE374510T1 (en) | 2007-10-15 |
| DE60222657T2 (en) | 2008-07-17 |
| EP1389402B1 (en) | 2007-09-26 |
| DE60222657D1 (en) | 2007-11-08 |
| SE0101793D0 (en) | 2001-05-21 |
| US20040127163A1 (en) | 2004-07-01 |
| WO2002096149A1 (en) | 2002-11-28 |
| EP1389402A1 (en) | 2004-02-18 |
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